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Second Opinions on Triple-GPU Scaling: AMD CrossFire Vs. Nvidia SLI

Last response: in Graphics & Displays
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March 15, 2011 10:18:54 PM

After reading this article that I found on here on Toms Hardware I sent it around thinking about how AMDs looking really good here for a multi card set up. When I start getting feedback it wasn't what I expected. Here are some replies--- A Few problems, outdated drivers, HDD bottleneck, CPU bottleneck, PCI E lane bottleneck, which skews 3 scaling, for 3 or 4 cards, it takes a ton of speed, and bandwidth to keep the cards from being bottleneck. AMD/Nvidia respond to the wire frames that the CPU creates it different, and varies with each engine used in the specific game.
The amount of various bandwidths will vary, the design of, and how each card manufacturer deal with various AA, shaders, ect is vastly different. With better drivers, better equipment, the results would be vastly different on the benchmarks that show obvious bottlenecking.--- So, was it a fair comparison? It's over my head so I was hoping to see what you guys think.


http://www.tomshardware.com/reviews/crossfire-sli-3-way...

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a c 597 U Graphics card
March 15, 2011 11:00:39 PM

A few problems with that article:

1) The GTX 570 and 6950 are not comparable cards. The higher performing GTX 570's will always be more bottlenecked by the CPU than the 6950's. To gain a more accurate picture, they would need to test 6970's in Crossfire.

2) Only 6 benchmarks does not give a complete picture. Add in that 3 of the 6 benchmarks notoriously favor AMD cards (F1, 3D Mark 11, Aliens vs. Predator), then you further skew the results.

3) The chart on Load Temps is indicative of the questionable nature of the review. 62c at load on GTX 570's in 3-way SLI? The 6950 in 3-way Crossfire only tops out at 58c? These results are quite astonishing, and are simply not supported by other review websites, or common sense.

4) Overall, this article just doesn't seem to match up with other reviews you will find around the web.

Here's one review that does a much better job, for example, 6970 Crossfire vs. GTX 570 SLI. It uses multiple benchmarks including those that favor each brand and some that are neutral. These benchmarks average out to 84% scaling for the 6970 in Crossfire, and 84% for the GTX 570 in SLI at 2560x1600, AF 16X, AA 8X(4X) (top chart on the right):




http://www.xbitlabs.com/articles/video/display/radeon-h...
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March 16, 2011 12:07:28 AM

Best answer selected by 10Broken.
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March 16, 2011 12:28:32 AM

Thank you!
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a c 597 U Graphics card
March 16, 2011 1:07:17 AM

Thanks to you. I knew there was something bothering me about that review. It was nice to take a closer look at some of the issues. Too bad no one came back with some positive or counter points.
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March 16, 2011 2:31:57 AM

That's funny you sent me the comparisons for the 6970s. That's what I'm gonna be rockin for a while.
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